Abstract
The penetration of multiple integrated renewable energies to the power grid are relevant for decision making in energy policy, environment and business. Such an electricity penetration is affected by the intermittent and volatile characteristics of integrated energies, mostly significantly related to the safe and stable electricity production and supply in real world. Here, this paper focuses on the low frequency oscillation analysis of the hydropower generation response to the wind and solar variability. To enable this analysis, a hybrid model of hydropower system integrating with the wind and solar power system is presented. The Nyquist and root-locus stability methods are used to investigate the sensitivity performance of the hydropower governor to the fluctuation of the integrated renewable energies. Additionally, to quantify the risk of the hybrid system, the low frequency oscillation response of hydropower system to wind/solar/hydropower quota and transmission line distance ratio is extensively investigated in this study. The results show that under the case of the wind, solar and hydropower ratio is 40:1:150, the optimal values for maximally reducing hydropower low frequency oscillation are finally determined as kp = 0.8, ki = 0.25 and kd = 0.5. Regarding a certain wind/solar/hydropower quota, it is a promising strategy to increase the solar-load transmission line in order to achieve the safe and stable operation of the hybrid system and a relatively excellent dynamic regulation capacity of the hydropower governor. The model, methods and results implemented in this study are exploited to markedly improve new knowledge applications, policy management, low carbon emissions and investment competitiveness of future energy systems.
Highlights
Renewable energy-based electricity generation is on the rise to supplement and replace conventional thermal-based power production
The mechanical drive shaft is an important component of the wind farm (WF), which coupled the wind turbine with the DFIGURE
The purpose of this section is to investigate the sensitivity of hydropower low frequency oscillations to regulation capacity of the grid-connected hybrid system
Summary
Renewable energy-based electricity generation is on the rise to supplement and replace conventional thermal-based power production. The ESS plays a damper and regulator role in grid-connection of renewable energies, and its storage status is generally summarized in three aspects [15]: (i) decoupling the timing of generation and consumption, (ii) ensuring the peak shaving and switching balance from one power energy to another one, and (iii) regulating electricity end-use quality To underline these goals, so far the hydropower system, which stores the surplus water energy in peak hours and consumes this energy at peak-load hours, is recognized as an ideal ESS for enhancing the economic and environmental profits, the transmission congestion mitigation, and the reduction of wind/solar curtailment in renewable energy integration [16,17]. The purpose of this study is to analyze the internal stability mechanism in the hybrid system and to quantify the influence of wind/solar power uncertainty on the hydropower low frequency oscillation.
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